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Homework Help: Inverse of an exponential

  1. May 19, 2012 #1
    1. The problem statement, all variables and given/known data

    Find the inverse of exp(y-x)+5

    2. The attempt at a solution

    I think the solution is y-ln(x-5) but I can't think of how to solve it to get that. I don't know what to do about the x and the y being together.
  2. jcsd
  3. May 19, 2012 #2


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    Homework Helper

    Welcome to PF!

    Hi AngryHan! Welcome to PF! :smile:
    This question makes no sense. :frown:

    Only functions have inverses.

    What is this a function of? x? y? y-x? :confused:
  4. May 19, 2012 #3
    Thanks tiny-tim :) It is a function of x I believe
  5. May 19, 2012 #4
    So, what is y? A parameter?
  6. May 19, 2012 #5
    I believe you need to take y to be a parameter, and let the function be

    f(x) = t = exp(y-x)+5

    Now, try to find the inverse.
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